This is the 1266th most frequent Russian word.
политической
The Russian word "политической" means "political" in English.
Here, "политическую" describes the nature of the discussion as related to politics, serving as an adjective modifying "дискуссию".
Принятие нового закона вызвало политическую дискуссию.
The adoption of the new law caused a political discussion.
In this case, "политической" modifies "системы," indicating the characteristics or focus of that system as pertaining to politics.
Учитель объяснил принципы политической системы.
The teacher explained the principles of the political system.
Here, "политической" is used to describe the type of activity, specifying that it is related to the field of politics.